I've seen the occasional complaint about Mail, but I love it. It handles my 8 main email accounts (mix of POP3 and IMAP) flawlessly, and doesn't slow down with the thousands of messages that I have.

I haven't used a PC as my main machine since before Thunderbird came out, so I can't say I have a really strong opinion either way on it. I set my mom up with it on her PC and she has no complaints, but then again she's not exactly a demanding user.

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